
.bookshelf {
    .header {
        margin: 20px;
        display: flex;
        justify-content: space-between;

        span {
            font-size: 18px;
        }

        .sou {
            font-size: 24px;
        }
    }
    .content {
        box-sizing: border-box;
        div{
            display: flex;
            justify-content: space-between;
            padding: 0 20px;
            flex-wrap: wrap;
            .book {
                margin-bottom: 50px;
                box-sizing: border-box;
                width: 30%;
                height: 150px;
                border: 1px solid #ccc;
                border-radius: 5px;
            }
        }
    }
}